huge woman; giantess
Refers to a woman of very large stature, often with a nuance of physical impressiveness or mythical size. Can be used literally or in fantasy contexts.
That huge woman was a volleyball player.
Giantesses often appear in old tales.
Compound of 大 (おお, 'big') and 女 (おんな, 'woman'). The reading おおおんな is a straightforward combination of the kun'yomi readings of the two kanji.